Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d9cd4eeaf130b2…

MALICIOUS

PDF

37.3 KB Created: 2020-09-17 10:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5017d4e080b7644b34930dffe82f64df SHA-1: a51a1536df7477964ba09b9b2952fbac660e97f7 SHA-256: 18d9cd4eeaf130b2aad3815dc486a305984dcc44b73a11c7303b0f122f41eab9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, likely intended to improve search engine ranking for malicious content. The primary malicious URL identified is https://ttraff.link/wix?keyword=unblocked+games+alpha+bubble+shooter, which is likely used to redirect users to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/wix?keyword=unblocked+games+alpha+bubble+shooter
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fcf8f566-e1c3-459b-9535-2bcd986f33b8.filesusr.com/ugd/18ee90_0c2692b0a2ad4f999b29908e5115d93d.pdf?index=true
    • https://8e195127-5cf7-4009-afb6-f89d8610db51.filesusr.com/ugd/27135d_7ba0eea91b1b4571b99d61d975330c14.pdf?index=true
    • https://802688f7-a9aa-4ab2-8909-d4a0bf7928b0.filesusr.com/ugd/47e66e_3fa4977697cd44deb8f47b6361836ab2.pdf?index=true
    • https://cd5f3ebe-21d7-4371-91bb-659b7ae4c88a.filesusr.com/ugd/c722c2_a77404bd0af2486e8574b016c3d3c29b.pdf?index=true
    • https://5b8d16fe-1c5e-4301-b038-4782c0e23369.filesusr.com/ugd/162fe6_0046cffc4efd457e98f742e5a779210e.pdf?index=true
    • https://487fe245-3b87-4c9c-a419-b5fc28f18111.filesusr.com/ugd/de3d83_b1bb2789375a4c59b16d95a225615d4e.pdf?index=true
    • https://a0ae527c-2807-4e4e-817d-4c4cd912f63b.filesusr.com/ugd/74e905_98bdb8f068d14c3ba739d644b34451be.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/9779/2420/files/32670689605.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0210/files/formation_chauffeur_de_bus.pdf
    • https://cdn.shopify.com/s/files/1/0439/0325/4683/files/metabolismo_bacterias.pdf
    • https://bd429ff4-21a9-4a16-b1f7-4e502dd7adb7.filesusr.com/ugd/2e79a6_fdcc0fe791394714a7a08867dd6f0245.pdf?index=true
    • https://82196029-6be0-400d-9896-7660ec55d91b.filesusr.com/ugd/565485_f3e30e06be964f4698b6634071de77c5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052c0.bin
40e0b761ad3c197edc19a00ca80df124a1ad3c303c714b0695172d407d49dbdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52C0 5684 bytes
font_01_sfnt_off000065e5.bin
beb2231df4f449e5efe586164745a6a1fbaabe6de3a08bc05990b7eedef32d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E5 10120 bytes

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